4GB KIT 2 x 2GB For Dell PowerEdge Series 1800 1855 2800 2850 6950 M605 M805 M905 R300 R805 R905 SC1425 SC1435 T300 T605 DIMM DDR2 ECC Registered PC2-5300 667MHz Single Rank RAM Memory 4GB KIT (2 x 2GB) DIMM DDR2 ECC Registered PC2-5300 667MHz Single Rank RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell PowerEdge Series. (See Compatibility List Below)